As pointed out by Livewire VPS's use a lot of server resources and therefore are somewhat costly for web hosting companies to maintain. I am fairly sure that the VPS service is the most expensive product currently offered by x10Hosting. Users who understand what a VPS is and have the skills to needed to setup and maintain their own unmanaged VPS find that the price of x10Hosting VPS service is a very good value, but it would probably not be practical to offer this service for free, even on a temporary trial basis. Also, I would imagine that the majority of people interested in VPS service are advanced users who fully understand what VPS service is and have a specific need for VPS service before they obtain the service so they do not need any free trial to determine if it is a service they need.
To more directly answer your question, you can try VPS service by ordering the service and trying it out for a month. Billing can be done on a month to basis. That is the option I currently use on my VPS service. However, you need to understand that VPS service at x10Hosting is unmanaged and you will need a good working knowledge of Apache, Linux, MySql, and Perl, just to name a few things. Frankly, VPS service is not for everybody.
Carl
